Choose the one alternative that best completes the statement or answers the question. -The focal length of a camera lens is 40 mm and its aperture diameter is 10 mm. What

Choose the one alternative that best completes the statement or answers the question.
-The focal length of a camera lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) 0.25
B) 4.0
C) 0.40
D) 2.0
E) 5.6

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